PBS Newshour: NSA 'taking full advantage' of spying laws to tap into Yahoo, Google traffic

Documents leaked by former NSA contractor Edward Snowden claim the NSA and its British counterpart tapped fiber-optic cables connected to Google and Yahoo data centers, gaining access to metadata from user accounts. Gwen Ifill talks to The Washington Post's Barton Gellman about the legality of the NSA alleged actions.